| 摘要 |
<p>Disk production apparatus, in which a plurality of beams (25-1, 25-2, ..., 25-N) are generated simultaneously from a laser light source (1) by means of an ultrsonic light defector (21, 22, 24), of which beams enter a common focussing lens (4); the light deflector is so controlled that each spot of the plurality of beams is located on the surface of the disk (6) exactly with a desired track pitch in the radial direction of the disk and when the disk is rotated once, a plurality of coaxial tracks (28-1, 28-2, ..., 28-N) are formed simultaneously, and disk recording apparatus in which a main beam (17) is located on a middle land (16-1, 16-2, 16-3) between two adjacent tracks (28-1, 28-2) and two side spots (18, 19) of subsidiary beams are placed on the two tracks so that the tracking signal is not influenced by data pits (20) and tracking is effected with a high reliability. </p> |
